Crusting and Whipped seem to be mutually exclusive terms.
The whipped icing used by most big box stores is Rich's Bettercreme (or Frostin'/Pastry Pride) which does develop a "skin" after sitting, but I've never heard of any members using the Viva method to smooth. (Usually it's a hot spatula to freshly applied product.)
Here's a faux Rich's Bettercreme recipe thread but I have no idea if the frosting crusts:
(My guess would be no, since Bettercreme doesn't....)
http://www.cakecentral.com/cake-decorating-ftopict-597074-.html
HTH
I dont think the Viva method would work with that either. I would say dip your untensils in warm water first.
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